Answer:
Option 2
Step-by-step explanation:
2 + ¾(t) > 10
¾(t) > 8
t > 32/3
t > 10 ⅔
Answer:
B. 95% confident the average concentration of PCBs in the water supply is between 2.9 ppb and 3.5 ppb
Step-by-step explanation:
You are given the total number of samples, the concentration of lead, and the standard deviation. The standard deviation represents how inaccurate the estimation of the concentration of lead in the drinking water. This means that there can only possibly be a 0.3 ppb error in the estimation. 3.2-0.3=2.9, and 3.2+0.3=3.5
Answer:
600
Step-by-step explanation:
Since 3/4 of 100 is 75, we have to divide 450 by three.
450 ÷ 3 = 150
150 x 4 = <em><u>600</u></em>
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<em> </em><em><u>Hope this helps :)</u></em>
<em><u>Please mark brainliest ;)</u></em>
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Answer:
Step-by-step explanation:
We need to sum the following two expressions:
expanding the polynomial in the numerator:
This is the most simplified form we can get:
Answer:
The number of boys who play tennis is 36.
Step-by-step explanation:
Let the number of boys who play tennis is x.
number of boys who play cricket = y
x = 3 y..... (1)
12 boys plays both cricket and tennis.
According to the question,
x - 12 = y + 1 2
3 y - 12 = y + 12
2 y = 24
y = 12
So, the number of boys who plays tennis is x = 3 x 12 = 36.
